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Diffstat (limited to 'doc/UsersGuide/ApplicationThorns.tex')
| -rw-r--r-- | doc/UsersGuide/ApplicationThorns.tex | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/doc/UsersGuide/ApplicationThorns.tex b/doc/UsersGuide/ApplicationThorns.tex index dcbc49bc..0b21bd77 100644 --- a/doc/UsersGuide/ApplicationThorns.tex +++ b/doc/UsersGuide/ApplicationThorns.tex @@ -1840,16 +1840,16 @@ void MyCRoutine(CCTK_ARGUMENTS) \paragraph{Complex variables} -Cactus supports complex grid variables, and since there is no -complex data type in C, Cactus provides a number -of functions for manipulating complex numbers to mirror the -functionality available in Fortran. These functions are \texttt{CCTK\_Cmplx}, -\texttt{CCTK\_CmplxReal}, \texttt{CCTK\_CmplxImag}, \texttt{CCTK\_CmplxConjg}, -\texttt{CCTK\_CmplxAdd}, \texttt{CCTK\_CmplxSub}, \texttt{CCTK\_CmplxMul}, -\texttt{CCTK\_CmplxDiv}, \texttt{CCTK\_CmplxExp}, \texttt{CCTK\_CmplSin}, -\texttt{CCTK\_CmplxAbs}, \texttt{CCTK\_CmplxLog}, and \texttt{CCTK\_CmplSqrt}. -See the Reference Manual for more details. - +Cactus supports complex grid variables of type \texttt{CCTK\_COMPLEX} which +are realized through the types \texttt{complex}, \texttt{std::complex} and +\texttt{COMPLEX} in C, C++ and Fortran respectively. Complex number support is +available in C in the C99 language standard which Cactus requires. + +There is a known incompatibility when \emph{returning} complex numbers from C +and Fortran functions to C++ callers on some architectures. Access to +variables through pointers and in arrays is not affected. A workaround is not +to return values but instead pass in a pointer to a local variable to hold the +return value. \paragraph{Specifically for C Programmers} |